Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 3,652	$ 11,117
Receivables, net	46,182	39,384
Inventories	43,295	33,436
Prepaid expenses and other current assets	5,311	3,383
Total current assets	98,440	87,320
Property, plant and equipment	135,245	126,837
Less accumulated depreciation and amortization	(71,963)	(70,268)
Net property, plant and equipment	63,282	56,569
Goodwill	115,570	107,905
Intangible assets, net	71,567	67,585
Non-qualified deferred compensation plan	4,425	4,327
Finance lease right of use assets	256	271
Operating lease right of use assets	8,639	9,053
Other assets	1,167	1,102
Total assets	363,346	334,132
Current liabilities:
Accounts payable	15,668	10,611
Accrued expenses	9,955	12,700
Deferred revenue	5,040	4,247
Finance lease liabilities	58	58
Operating lease liabilities	1,994	2,181
Income taxes payable	2,109	909
Current installments of long-term debt	4,000	4,000
Total current liabilities	38,824	34,706
Long-term debt, excluding current installments	91,000	71,000
Deferred income taxes	3,440	3,263
Non-qualified deferred compensation plan	4,457	4,337
Finance lease liabilities	200	215
Operating lease liabilities	6,788	6,903
Other liabilities	19,559	19,262
Total liabilities	164,268	139,686
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $.01 par value, 1,000,000 shares authorized; no shares issued	0	0
Common stock, $.01 par value, 20,000,000 shares authorized; 7,591,054 and 7,561,495 shares issued and outstanding, respectively, at March 31, 2022; 7,564,645 and 7,535,086 shares issued and outstanding, respectively, at December 31, 2021	76	75
Additional paid-in capital	33,543	34,151
Retained earnings	165,665	160,807
Accumulated other comprehensive income	381	0
Treasury stock at cost, 29,559 shares at March 31, 2022 and 29,559 shares at December 31, 2021	(587)	(587)
Total stockholders’ equity	199,078	194,446
Total liabilities and stockholders' equity	$ 363,346	$ 334,132